Gibbs Free Energy Formula:
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Definition: Gibbs Free Energy (G) is a thermodynamic potential that measures the maximum reversible work that may be performed by a thermodynamic system at constant temperature and pressure.
Purpose: In electrochemistry, it helps determine the spontaneity of redox reactions in electrochemical cells.
The calculator uses the formula:
Where:
Explanation: The negative sign indicates that a spontaneous reaction (positive Ecell) corresponds to a negative ΔG.
Details: Calculating ΔG helps predict whether a redox reaction will occur spontaneously and determines the maximum electrical work obtainable from the cell.
Tips: Enter the moles of electrons transferred in the redox reaction and the measured cell potential. Both values are required.
Q1: What does a negative Gibbs free energy mean?
A: A negative ΔG indicates a spontaneous reaction that can perform work.
Q2: How do I determine moles of electrons transferred?
A: Balance the redox reaction to find the stoichiometric coefficient of electrons.
Q3: What units does this calculator use?
A: The calculator uses SI units: Joules for energy, moles for electrons, and Volts for potential.
Q4: Why is Faraday's constant used?
A: It converts between moles of electrons and electrical charge (Coulombs).
Q5: Can this be used for non-standard conditions?
A: This calculates standard ΔG. For non-standard conditions, use the Nernst equation first.